A rotor ventilator comprising a ventilator stator for mounting to a structure and a ventilator rotor for mounting and rotation with respect to the ventilator stator is disclosed. The ventilator further comprises a cover for positioning over the ventilator rotor and mounting to the ventilator stator. The cover comprises a central portion surrounded by an outer substantially concave portion. The outer concave portion of the cover may protect the ventilator from environmental conditions/elements, such as by redirecting particles, water droplets, debris and dust, etc away from the interior of the ventilator. The outer concave portion may act as a trough, from which the particles can then be directed off the cover. The trough may also act to prevent the particles from escaping over the sides of the cover, and into the ventilator.

A coal and gas outburst monitoring device includes the insertion and anchoring assembly, and the pump drainage and monitoring mechanism; the insertion and anchoring assembly is vertically inserted and distributed on the sidewall of surrounding rock of coal mine roadway, and the insertion and anchoring assembly can monitor the stress change data in the sidewall of surrounding rock in real time; the pump drainage and monitoring mechanism is erected within the coal mine roadway, and the pump drainage and monitoring mechanism can cooperate with the insertion and anchoring assembly to perform the gas pump drainage monitoring for the sidewall of surrounding rock of goaf, and to obtain the gas seepage monitoring data in the surface layer and the inner layer of sidewall of surrounding rock. Thus, comparing with the database mechanism, the accurate and advanced predictions for the gas outburst can be made.

A coal and gas outburst monitoring device includes the insertion and anchoring assembly, and the pump drainage and monitoring mechanism; the insertion and anchoring assembly is vertically inserted and distributed on the sidewall of surrounding rock of coal mine roadway, and the insertion and anchoring assembly can monitor the stress change data in the sidewall of surrounding rock in real time; the pump drainage and monitoring mechanism is erected within the coal mine roadway, and the pump drainage and monitoring mechanism can cooperate with the insertion and anchoring assembly to perform the gas pump drainage monitoring for the sidewall of surrounding rock of goaf, and to obtain the gas seepage monitoring data in the surface layer and the inner layer of sidewall of surrounding rock. Thus, comparing with the database mechanism, the accurate and advanced predictions for the gas outburst can be made.

An underground ventilation system having a fan, a plurality of ducts for the delivery of air to an underground work space, flow control dampers at duct branches, a fan sensor module to detect velocity, pressure, temperature and/or humidity, a work space sensor in each work space, a connection panel in communication with the fan sensors and with each automated flow control damper and configured to exchange status and control information with the fan sensor, the flow control dampers, and work space sensors, a cabling system attached to the ducts and connected to the connection panel and to automated flow control dampers, and a display and control system in electronic communication with the fan, the fan sensor, the automated flow control dampers, and the work space sensors, via the connection panel.

An underground ventilation system having a fan, a plurality of ducts for the delivery of air to an underground work space, flow control dampers at duct branches, a fan sensor module to detect velocity, pressure, temperature and/or humidity, a work space sensor in each work space, a connection panel in communication with the fan sensors and with each automated flow control damper and configured to exchange status and control information with the fan sensor, the flow control dampers, and work space sensors, a cabling system attached to the ducts and connected to the connection panel and to automated flow control dampers, and a display and control system in electronic communication with the fan, the fan sensor, the automated flow control dampers, and the work space sensors, via the connection panel.

The present disclosure concerns a tempering assembly for tempering air of a facility, the tempering system being fluidly connectable to a tempering fluid source and comprising: a reactor defining an air-tempering cavity and comprising: an air inlet to introduce ambient air into the air-tempering cavity, and an air outlet fluidly connectable to the facility to expel into the facility the tempered air out of the air-tempering cavity; a tempering fluid provider fluidly connectable to the tempering fluid source and configured to provide the tempering fluid within the air-tempering cavity to temper the air circulating within the air-tempering cavity; an evacuation system fluidly connected to the air-tempering cavity and configured to remove the tempering fluid from the reactor cavity. It also concerns a corresponding method.

The present disclosure concerns a tempering assembly for tempering air of a facility, the tempering system being fluidly connectable to a tempering fluid source and comprising: a reactor defining an air-tempering cavity and comprising: an air inlet to introduce ambient air into the air-tempering cavity, and an air outlet fluidly connectable to the facility to expel into the facility the tempered air out of the air-tempering cavity; a tempering fluid provider fluidly connectable to the tempering fluid source and configured to provide the tempering fluid within the air-tempering cavity to temper the air circulating within the air-tempering cavity; an evacuation system fluidly connected to the air-tempering cavity and configured to remove the tempering fluid from the reactor cavity. It also concerns a corresponding method.